LGOLED55B7V Clicking and dead screen.

[Davi.p]

Re: LGOLED55B7V Clicking and dead screen.

The tcon has more than 2 cables, only those from MB must be isolated, how do you think screen can be energized if not?

[Donny2derby]

Re: LGOLED55B7V Clicking and dead screen.

Yea I understand that Davi which is why I asked!

There is 2 photos below of cables currently detached. P201 from power board to main board and 2 ribbon cables from main board to tcon.

This is as you wish?

[Donny2derby]

Re: LGOLED55B7V Clicking and dead screen.

With the cables as shown in the photos the result is the same.

[Donny2derby]

Re: LGOLED55B7V Clicking and dead screen.

you have short cell on the Panel module .. SOS signal come to MB turn off the set if you disconnect only the black cable between the Power boards and the T-CON ... it will start and stay on ( sign are the Audio Optic port lit red ) none repairable ..

I have also tried this test as well Diah and get the same result. There is no image displayed and no standby light.

So could this be a fault on tcon?

[Donny2derby]

Re: LGOLED55B7V Clicking and dead screen.

With everything plugged back in. When using the RC to try and power on I get a very faint vertical line on the entirety of the screen about 1/3rd of the way in from the RHS. I can also hear the relay switching and have the same 3 LED blink then the relay again switches.

But at no point is a screen test visible or do I get a green indicator replacing the red standby light. So to me it’s not even trying to function correctly.

Am I fighting a losing battle here? Or do I order replacement tcon/main boards? They’re not cheap! @davi @diah what are your thoughts please?

Thanks.

[Diah]

Re: LGOLED55B7V Clicking and dead screen.

don't spend cent on it.. scrap it... you have OLED Cells short on Panel.... TV turn off because the T-CON send SOS SIgnal to MB MICOM to order the power boards to turn off... avoiding the panel get in fire caused by OLED cells

[Donny2derby]

Re: LGOLED55B7V Clicking and dead screen.

Well Diah. You are the doyen of tv repair on badcaps so I shall reluctantly do as you say.

This is a sad day for me! 100 of the finest British pounds flushed down the pan!

Thanks for your help and advice. Onto the next 2 projects. Luckily I believe these to be simple backlight issues.

Out of interest Diah, and to help me improve my own knowledge and understanding. Is there a way I can actually see the phenomenon you’re referring to of an SOS signal to the MICOM (and tell me what this acronym is) can this be detected using a multimeter?

[Davi.p]

Re: LGOLED55B7V Clicking and dead screen.

Wait donny.. don't think someone is god and knows everythink..
i'm at work now so i might not follow you but i do, only to take a small break..
i don't know why you detach cables from psb to tcon, them are needed to feed the tcon as i already said, i don't remember well but if in this way you don't see test, it's probably because there is another 12v supply line that runs in the MB to Tcon cables, so what you have to do is to keep them detached but locate the 12v pins on one of the two cables, there are many and next to each other, and solder a thick wire (0,5sqmm) from 12VT/PSB to TCon 12V pins from MB..
if you give up it's your decision but it's stupid at this point..

[Diah]

Re: LGOLED55B7V Clicking and dead screen.

for yours safety, and yours room didn't catch fire, don't play with this OLED any more..and don't try to run the screen Test as standalone.... you will get really fire.

[Davi.p]

Re: LGOLED55B7V Clicking and dead screen.

There are fuses on tcon that can protect from higher currents.. furthermore when few days ago the tv was working did not have any sign of burnt, now probably the tcon is in protection state due to faulty screen or faulty software/HW on tcon, so an oled tv can't be explosive, it can't catch fire immediately like a fire torch

[Diah]

Re: LGOLED55B7V Clicking and dead screen.

Fuse for 24V rail (OLED driver at T-CON) rated 250 -280V .... fire will start on screen then the room too ... then fire police will arrive and the Fuse will never goes open.

[Davi.p]

Re: LGOLED55B7V Clicking and dead screen.

OLED panels for what few times i'watched them are almost glass, how can glass so flammable?

[Diah]

Re: LGOLED55B7V Clicking and dead screen.

cells mounted on film.. covered by thin plastic layers no glass.. on the back side of the film one layer white paper followed with aluminum paper to transfer the heat to screen chassis

[Davi.p]

Re: LGOLED55B7V Clicking and dead screen.

https://youtu.be/xAMhX3Drq14

[Donny2derby]

Re: LGOLED55B7V Clicking and dead screen.

Thanks you both for your support and knowledge. It’s been very informative.

Now I don’t know what to do for best. I am thinking to perform test Davi suggests of linking 12Vt to tcon and asking girlfriend to perform test with fire extinguisher on standby! Haha.

[Davi.p]

Re: LGOLED55B7V Clicking and dead screen.

🛌🏼

[Davi.p]

Re: LGOLED55B7V Clicking and dead screen.

ok i made another user do the procedure in post 48 and it is working.. further watched another documents where oled screens are almost glass, no risk of fire.. so no reason to...

🛌🏼 Zzzzzz...

[markolino]

Re: LGOLED55B7V Clicking and dead screen.

Hi Donny2derby

would you sell me the main board ?? and T-Con.. if it still works of course..

I have a similar case, but I have a fault with either the Tcon or the main board.. you can read my post above...

Link:
https://www.badcaps.net/forum/showth...29#post1270629